<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
    <frameset rows="10%,*">
        <frame src="top.html">
        <frameset cols="10%,*">
            <frame src="left.html">
            <frame src="main.html" name="mainFrame">
        </frameset>
    </frameset>
</html>